Load Specifications
Load data in caliber .300 WSM with .308 | 150gr | Hornady SP bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Hodgdon Superformance and ReloadSwiss RS 60.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 56,115 psi | 88% | 2949 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,158 psi | 86% | 2976 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,884 psi | 89% | 3045 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,012 psi | 85% | 2966 fps | 96.4% |
| Accurate 4064 | <<locked>> | 90% | 55,056 psi | 86% | 3025 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,143 psi | 86% | 3107 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 55,288 psi | 87% | 3054 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,391 psi | 88% | 3054 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,711 psi | 90% | 3058 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,332 psi | 87% | 2982 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,201 psi | 87% | 3179 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,449 psi | 88% | 3077 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,116 psi | 90% | 3104 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3169 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,838 psi | 84% | 3146 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,321 psi | 63% | 2881 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,368 psi | 71% | 3051 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,158 psi | 86% | 3068 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 57,522 psi | 90% | 3097 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,232 psi | 90% | 3061 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,028 psi | 88% | 2989 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,537 psi | 90% | 3091 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,767 psi | 87% | 3140 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 90% | 54,520 psi | 85% | 3051 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 96% | 54,389 psi | 85% | 3104 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 94% | 54,984 psi | 86% | 3064 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 86% | 55,854 psi | 88% | 3068 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,388 psi | 82% | 3035 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,477 psi | 87% | 3100 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,940 psi | 86% | 3136 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 56% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,130 psi | 90% | 3068 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,912 psi | 88% | 3051 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,999 psi | 88% | 3041 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,840 psi | 88% | 3015 fps | 97.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3087 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,738 psi | 87% | 3041 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,521 psi | 87% | 3094 fps | 99.5% |
| IMR 4895 | <<locked>> | 88% | 54,955 psi | 86% | 3081 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 57,711 psi | 90% | 3058 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,187 psi | 86% | 3028 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,781 psi | 86% | 2979 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,767 psi | 87% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,085 psi | 86% | 3031 fps | 98.6% |
| Lovex S070 | <<locked>> | 98% | 56,173 psi | 88% | 3071 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 57,638 psi | 90% | 3051 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,723 psi | 86% | 3002 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,318 psi | 88% | 3087 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3150 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 57,000 psi | 89% | 3114 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3143 fps | 98.5% |
| Ramshot TAC | <<locked>> | 84% | 54,636 psi | 86% | 3022 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,230 psi | 85% | 3038 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,187 psi | 86% | 3005 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,042 psi | 56% | 1932 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,246 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,882 psi | 86% | 3031 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,070 psi | 85% | 3117 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,363 psi | 90% | 3205 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,766 psi | 86% | 3127 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,360 psi | 85% | 3156 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 84% | 55,158 psi | 86% | 2986 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,563 psi | 86% | 2995 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,072 psi | 89% | 3084 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,232 psi | 90% | 3061 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,085 psi | 86% | 3031 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,187 psi | 86% | 3028 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,767 psi | 87% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,173 psi | 88% | 3071 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,245 psi | 87% | 3094 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,695 psi | 89% | 3054 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,435 psi | 90% | 3081 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,477 psi | 87% | 2936 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,796 psi | 87% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,492 psi | 87% | 2982 fps | 97.5% |
| Somchem S321 | <<locked>> | 82% | 55,622 psi | 87% | 3038 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,868 psi | 86% | 2933 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,231 psi | 88% | 3041 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 57,246 psi | 90% | 3081 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,025 psi | 82% | 3094 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 55,187 psi | 86% | 2900 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,738 psi | 87% | 2920 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,360 psi | 85% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,056 psi | 86% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,230 psi | 87% | 3009 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,652 psi | 89% | 3091 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 54,810 psi | 86% | 3005 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,840 psi | 89% | 3022 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,738 psi | 87% | 3097 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,280 psi | 69% | 2963 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,203 psi | 90% | 3071 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,911 psi | 86% | 3054 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,389 psi | 85% | 3104 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,100 psi | 57% | 2874 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,435 psi | 90% | 3087 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 49,632 psi | 78% | 2854 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,453 psi | 67% | 2772 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,632 psi | 78% | 2933 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,662 psi | 79% | 2907 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 40,103 psi | 63% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 36,245 psi | 57% | 2740 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 45,818 psi | 72% | 2887 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 38,972 psi | 61% | 2723 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,906 psi | 75% | 2897 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,385 psi | 76% | 2884 fps | 100% |
| Alliant Power Pro 2000-MR | 58.8 gr | 80% | 41,800 psi | 66% | 2913 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,667 psi | 61% | 2746 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,510 psi | 65% | 2815 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,274 psi | 57% | 2756 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,460 psi | 52% | 2707 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,459 psi | 49% | 2644 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 39,291 psi | 62% | 2913 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,136 psi | 71% | 2887 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 38,406 psi | 60% | 2749 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 47,369 psi | 74% | 2887 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,414 psi | 77% | 2881 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,949 psi | 74% | 2917 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,996 psi | 81% | 3074 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 80% | 39,175 psi | 61% | 2753 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 90% | 44,411 psi | 70% | 2917 fps | 95% |
| Hodgdon H4350 | <<locked>> | 92% | 51,590 psi | 81% | 3005 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 46,253 psi | 72% | 2897 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,328 psi | 49% | 2589 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,206 psi | 66% | 2861 fps | 99.2% |
| Hodgdon Superformance | 70.4 gr | 92% | 47,645 psi | 75% | 2999 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 41% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,324 psi | 69% | 2844 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 45,905 psi | 72% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,915 psi | 64% | 2762 fps | 97.7% |
| IMR 4166 Enduron | <<locked>> | 82% | 46,137 psi | 72% | 2838 fps | 95.4% |
| IMR 4350 | <<locked>> | 94% | 47,718 psi | 75% | 2917 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,311 psi | 73% | 2871 fps | 95.4% |
| IMR 4831 | <<locked>> | 86% | 34,983 psi | 55% | 2690 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 42,525 psi | 67% | 2848 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 47,906 psi | 75% | 2897 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 45,194 psi | 71% | 2864 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,672 psi | 72% | 2818 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 40,843 psi | 64% | 2766 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 40,408 psi | 63% | 2753 fps | 95.3% |
| Lovex S070 | <<locked>> | 90% | 43,613 psi | 68% | 2838 fps | 95% |
| Norma 201 | <<locked>> | 80% | 44,875 psi | 70% | 2835 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 45,237 psi | 71% | 2844 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,872 psi | 64% | 2802 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 36,521 psi | 57% | 2743 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 40,524 psi | 64% | 2815 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 43,337 psi | 68% | 2900 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 47,819 psi | 75% | 2900 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,514 psi | 74% | 2923 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,605 psi | 81% | 2946 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 42% | 1729 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,693 psi | 84% | 2982 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,163 psi | 66% | 2792 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,859 psi | 69% | 2927 fps | 98.3% |
| ReloadSwiss RS 60 | 57.9 gr | 80% | 35,592 psi | 56% | 2779 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,100 psi | 57% | 2759 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,667 psi | 61% | 2825 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 48,762 psi | 76% | 2881 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,685 psi | 67% | 2785 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 36,114 psi | 57% | 2690 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 47,369 psi | 74% | 2887 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,408 psi | 63% | 2753 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,194 psi | 71% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,843 psi | 64% | 2766 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 90% | 43,613 psi | 68% | 2838 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,086 psi | 58% | 2743 fps | 97.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,195 psi | 72% | 2874 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,295 psi | 69% | 2851 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,137 psi | 72% | 2789 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,450 psi | 60% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,513 psi | 71% | 2808 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 51,967 psi | 81% | 2979 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,803 psi | 72% | 2789 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,948 psi | 72% | 2871 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 36,912 psi | 58% | 2697 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 28,703 psi | 45% | 2572 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 51,953 psi | 81% | 2851 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,470 psi | 73% | 2782 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,250 psi | 66% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,830 psi | 67% | 2776 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,099 psi | 55% | 2631 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 84% | 35,563 psi | 56% | 2684 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 48,066 psi | 75% | 2890 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 41,321 psi | 65% | 2762 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 37,536 psi | 59% | 2743 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 33,910 psi | 53% | 2726 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,154 psi | 49% | 2546 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 47,950 psi | 75% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,628 psi | 70% | 2920 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,749 psi | 50% | 2733 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,888 psi | 69% | 2858 fps | 99.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 95 powders for .300 WSM loaded with the .308 | 150gr | Hornady SP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,205 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .300 WSM with the .308 | 150gr | Hornady SP they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.